a trigger event, such as displaying a message on a certain date, or deleting files after the infected program is run a certain number of times.
             Usually a virus has two distinct functions:
             1. Spreads itself from one file to another without your input or knowledge. Technically, this is known as self-replication and propagation.
             2. Implements the symptom or damage planned by the perpetrator. This could include erasing a disk, corrupting your programs or just creating havoc on your computer. Technically, this is known as
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